The Book of Demons takes an in-depth look at the Abyssal enemies of the 13^th Age—the demonic hordes whose eternal struggle to shatter reality causes hellholes, dimensional breaches, and other, even weirder assaults on the world.

For Players:

• A new demonologist PC class, with three paths: corruption, flame, and slaughter!

For Game Masters:

• Six detailed hellholes and their denizens, plus advice on making your own
• A new random demon abilities table
• Citadels of the Crusader and the Diabolist
• Monster stats for nine new demons summonable by player character demonologists